Finding the Fourth Proportional to 5,139.69, 7,092.82 and 2,781.88

Step by Step Solution

1. Step 1: Write the proportion equation
   5,139.69 : 7,092.82 = 2,781.88 : x
2. Step 2: Convert to fraction form
   5,139.69/7,092.82 = 2,781.88/x
3. Step 3: Cross multiply
   5,139.69x = 7,092.82 × 2,781.88
4. Step 4: Simplify right side
   5,139.69x = 19,731,374.10
5. Step 5: Solve for x
   x = 19,731,374.10/5,139.69
6. Step 6: Final answer
   x = 3,839.02